/*
 * Copyright 2023 AntGroup CO., Ltd.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 */

package com.antgroup.geaflow.model.graph.message;

import java.util.NoSuchElementException;

public class DefaultGraphMessage<K, MESSAGE> implements IGraphMessage<K, MESSAGE> {

    private final K targetVId;
    private MESSAGE message;

    public DefaultGraphMessage(K targetVId, MESSAGE message) {
        this.targetVId = targetVId;
        this.message = message;
    }

    public MESSAGE getMessage() {
        return this.message;
    }

    @Override
    public K getTargetVId() {
        return this.targetVId;
    }

    @Override
    public boolean hasNext() {
        return this.message != null;
    }

    @Override
    public MESSAGE next() {
        if (this.message == null) {
            throw new NoSuchElementException();
        }
        MESSAGE msg = this.message;
        this.message = null;
        return msg;
    }

    @Override
    public String toString() {
        return "DefaultGraphMessage{" + "targetVId=" + targetVId + ", message=" + message + '}';
    }

}
